-ist

(Greek > Latin: a suffix; one who believes in; one who is engaged in; someone who does something)

Someone who specializes in the study of minerals of importance to farming and horticulture: "The agrogeologist is especially interested in the relationships of soil fertility and the various fertilizer components."

A specialist in the scientific study of algae; also called a phyologist.

allogorist

1. Someone who makes representations of abstract ideas or principles with characters, figures, or events in narrative, dramatic, or pictorial form.
2. Anyone who uses stories, pictures, or who employs such representations: "John Bunyan's Pilgrim's Progress and Herman Melville's Moby Dick are considered to be allegories.
3. A symbolic representation: "The blindfolded figure holding scales is an allegory of justice."

1. Those who believe in and who practice an unselfish concern for the welfare of others: The charitable acts by the altruists were motivated purely by a real concern for those who needed help during the flooding.
2. Etymology: from Latin alteri, a form of alter, "other, another".